The smart latest installment of Andrews’s semi-post-apocalyptic urban fantasy series (after Gunmetal Magic) takes mercenary Kate Daniels and her mate, the werelion Curran, to the Carpathian Mountains. In exchange for bodyguarding a pregnant shapeshifter during a critical time of negotiation between three powerful packs, they’ll receive ample amounts of the panacea drug, essential for ensuring the future of their own people. But the mountains are full of strange beasts and deadly mythological creatures, and one of Kate’s greatest enemies is hosting the convocation, heralding a confrontation she’s not ready for. Nonstop action and intrigue fill the halls of the secluded castle as schemes come to fruition. Vividly imagined fight scenes, clever use of obscure mythology, a uniquely interesting setting, and rich characterization make this a rare treat, only hampered by the complexity of the pre-existing knowledge required to fully appreciate the developments and conflicts. Agent: Nancy Yost, Nancy Yost Literary Agency. (Aug.)